Injector



(Model.)

W. T. MESSINGER.

INJBUTOR.

` zle in starting the injector, as in the patents,

'UNITED STATES PATENT v@narciso WILLIAM T MEssINcER, on CAMBRIDGE, MASSACHUSETTS.

INJ ECT SP1- .CIF.'[GA'.T.IO1\T formingpart of Letters Patent No. 350,547, dated October 12` 1886. v

Application filed September 7, 1885. Serial No.176,38. (ModelJ/ To all whom it may concern: A

Be it known that I, WILLIAM T. MESSINGER, of Cambridge, county of Middlesex, State of Massachusetts, have invented an Improvement in Injectors, of which the following description, in connection with the accompanying drawings, is aspecilication, like letters on the drawings representing like parts.

My invention relating to injectors is eInbodied in an injector of the class shown in Letters Patent No. 281,385, dated July 17 ,1883, and No. 802,273, dated July 22,1884, the injector containing three nozzles, the first and third or rearmost and foremost of which may be placed in communication with asteam-inlet passage or chamber, and the intermediate one of which nozzles communicates at its basewith a waterinlet chamber. The injector is shown and will be described as standing in a vertiealposition, receiving steam at its upper end and delivering the stream of liquid from its lower end.

The-invention consists, essentially, in the novel construction of the valves or devices controlling the admission of steam to the first and third nozzles, the devices operating to admit steam to the rst nozzle for a short period of time before it is admitted to the third nozreferred to.

The invention further consists in details of construction of the overliowchamber.

Figure l is a longitudinal section of an injector embodying this invention, shown with the valves closed in the position occupied when the injector is not in operation Fig. 2, a similar section on a plane at right angles to that of Fig. 1, showing a somewhat modilied construction of t-he valves, which are open, or in the position occupied when the injector is in operation Figs. 3 and 4, transverse sections on linesxand y, respectively, Fig. 1; and Figs. 5 and 6, a plan view and side elevation, re-

l, spectively, of the valve controlling the iiow of steam to the third nozzle, Fig. 5 also showing the steanrchamber in section.

The injector comprises in its construction a piece or casting, c, provided with a steam-inlet passage, c2, and closed at its end-by a bonnet, c, which also constitutes the nut for the threaded valve-stem b. The said casting a has fastened to it a piece or casting, c, connected by a coupling-nut, d, with a casting,c, having the y second or intermediate nozzle, e', made integral with it, and having formed Within it and around the mouth of the said nozzle a Water-in let chamber, c2, provided with a water-inlet passage, e, the Said casting also containing ports or passages c, (see Figs. 2 and 4,) passing longitudinally through it, and thus forming the connection between -the steam-chamber a in the casting a and the base or mouth of the third nozzle, f,`madein a casting, f, connected with the casting @by thc coupling-nut d. The casting e has attachedto'it, by screw-threads or otherwise, the first nozzle, g, which extends into'the piece c, thati'ormsa continuation of the steam-chamber, there being a suiiicient space around thc nozzle-piece g and within the piece 0 for the passage of steam to the ports c and third nozzle, f The piece c is made separately from the piece c, in order that the coupling-nut 'd may be applied to it, andis tightly connected with the piece a by screw-threads or otherwise, the said piece c having an internally-projecting squared ridge, c, (see Fig. 3,) to receive a suitable tool to hold it While being screwed tightly into the piece a, it never being intended to separate the pieces c and c after the injector is once put together. -The pieces c and c are bored smoothly to form a cylinder or steam-chamber, a', in which is tightly fitted a piston, 71, having a passage, L, through it, and co-operat-ing with a seatV around the mouth of the nozzle g, as shown in Fig. 1,`in which position it prevents the passage ofsteam around the nozzle g to the passages e and nozzle f. The piston h thus constitutes a valve which controls the dow of steam to the third nozzle, and will be called the secondary valve, and is provided at its upper end with a seat for a valve, t',which,when seated thereon, prevents the passage oi' steam from the chamber c into thc passage h', which leads directly tothe passage in the nozzle-piece g. The valvez' is connected with the stem b in such manner as to permit the said stem to turn independently thereof.

As shown in Fig. 1, the stem has a head, b', grooved to receive a wire, b2, passed through the valve t', and having its ends bent down in a groove surrounding the said valve. Vhen IOO the stem b is turned by itshandle b3, the main valve z' is unseated, permitting the steam'to pass into the passage h', and thence through the first nozzle, g, where it operates to produce a vacuum in the water-chamber ci' and raise the water thereto in the usual manner. IIhe secondary valve or piston h is provided with arms h2, which extend up into and are guided by the lower portion of the bonnet a", which screws into the casting a, as shown in Fig. 2, the interior of the said bonnet being bored to the same size as the steam-chamber a. The said arms ht have at their upper ends lateral projections hwhieh, after the valve i has been raised a certain distance from its seat, are engaged by the said valve, so that in the further movement of the valve-stem the piston h is drawn through the cylinder, raising its lower end from its seat around the nozzle y, and thus permitting steam to pass below its lower edge and around the saidk nozzle to the passages c", and thence to the nozzle f', as shown by the arrows, Fig. 2.

As shown in Fig. l, the seat on the nozzlepiece g for the lower end of the piston h is made of soft or somewhat yielding material, (shown at g as held in a recess in the piece g by a suitable thimble, g2) and the seat for the valve t' at the upper end of the piston h is of precisely similar construction. As shown in FiO. 2, the packing is dispensed with, and tight joints are insured by thecontact of a curved with a conical or tapering surface, as will be readily understood from the drawings.

As shown in Fig. 2, the head of the valvestem I) is held in the valve 'i by a nut, b3, instead of by a wire, as shown in Fig. 1. The piston h is provided with suitable packing where it operates in the cylinder, said packing being shown in Fig. 1 as consisting of a ring, h4, of soft material,held in place by a nut, ,screwed onto the said piston,while, as shown in Fig. 2, the piston has a groove, in which rings L, of metallic packing, are sprung.

In order to retain the arms l1,2 of the piston h at right angles to the steam-inlet a2, orso that they will not close the said inlet, the said arms are provided with external proj eetions h, which engage longitudinal grooves ai (see Figs. 2 and 5) in the steanrchamber a,thus preventing the rotation of the piston hin the said chamber. The steam for both nozzles passes through the interior of the secondary valve instead of passing around the exterior thereof to the third nozzle, as in the patents referred to.

The construction of the castings e andf is substantially the same as in another application filed herewith, and the operation is substantiall y the same as in the patents hereinbefore referred to. The said casting f constitutes a chamber around the nozzle f', which chamber may have screwed within it a discharge-tip, 7;, and is threaded at its outside to receive a coupling-nut, a, byi which a suitable nipple, m, may be connected with the said casting f, serving to receive the pipe which conveys the stream of liquid forced by the injector to the boiler or other point where it is to be used.

The chamber f is provided with a lateral opening, f2, (see Fig. 1,) and wien used as an overflowchamber will preferably have attached to the said opening an auxiliary overfiow-chamber, p, having a passage, p', terminating in a raised valve-seat, p2, which has an annular depression or recess, p, around it. Above the valve-seat p2 is a guide-passage, p, for the valve p5, made as an inverted cup, the edges of which enter the annular recess p when the valve is seated, and after the fluid has been flowing through the passage p and valve-seat it will accumulate in the said annular recess, so that when the valve pi drops it will enter the liquid in the said. annular recess, thus forming a tightly-sealedjoint. rllre guide-passage p is closed by a cap, p, after the valve has been inserted, and is provided with a lateral outlet or discharge-passage, p7, through which the liquid escapes, the valve pi being raised by the said liquid above the mouth of the said passage p7 or the lower edge thereof.

I claiml. An injector having three nozzles and a passage around the first and second leading to the third, combined with a cylindrical steam-chamber communicating with the first and third nozzles, and piston therein provided with a longitudinal. passage and co-operating with a seat around the mouth or inlet of the said first nozzle, and a valve seating on said piston controlling the iiow offlnid through the passage thereof, and adapted in its movement from its seat to engage the said piston and remove it from its seat, permitting fluid to pass through the passage of said piston and around the first nozzle to the third nozzle, substantially as described.

2. An injector having three nozzles and a steam-chamber communicating with the rst and third,provided with a bonnethaving an internally-tln'eaded passage, combined with a secondary valve controlling the flow of fluid from the steam chamber to the third nozzle, and a main valve cooperating therewith, control,- ling the iiowof fluid to the first nozzle, thesaid secondary valve being provided with arms fitting within the bonnet of the steam-chamber, and having projections to be engaged by the main valve, substantially as described.

3. ln an injector, the combination, with a main overflow-chamber provided with a lateral opening, of an auxiliary or external overflow-chamber having a passage communicating with the interior of the main or usual overflow-chamber, terminating in a raised valve-seat having an annular recess around it, a valve-chamber above the said valve-seat, and a cup-shaped valve therein, the edges of which enter the annular recess around the valve-seat, and a lateral discharge-passage from said valve-chamber, substantially as described.

IOO

IIO

4. An injector having` three nozzles and a and other projections to be engaged by the ro steamehamber communicating with the rst main valve, substantially as described. and third, provided with a lateral steam-inlet In testimony whereof Ihavc signed my naine andwithlongitudinalguidegrooves,combined to this specification in the presence of two with a main and secondary valvecontrolling subscribing,` Witness.

the flow of steam to the first and third nozzles, VM. T. MESSINGER. respectively, tliesaid secondary valve being Wtnsses: provided with arins having projections enter- Jos. P. LIVERMORE,

ing the guide-grooves of the steam-chamber H. P. BATES. 

